Does it need full sun?

It prefers partial shade but will tolerate full sun if the soil stays consistently moist.

How do I control its spread?

You can dig up the edges of the clump in early spring to keep it within its designated area.

Plant guide

Hairy sedge.

Carex hirta

Pronounced KAIR-eks HUR-tuh

Also known as Hairy Sedge, Hammer sedge

The hairy sedge is a resilient perennial grass like plant that thrives in moist, open habitats. It spreads through underground rhizomes, making it quite effective at colonizing damp areas in your garden. You will find it adds a nice, soft texture to any landscape.

At a glance

Care level: Easy
Plant type: perennial sedge
Light: full sun to partial shade
Indoor light: Bright indirect
Water: Every 3 to 7 days
Mature size: 1 to 2 feet
Growth rate: Medium
Hardiness: USDA 4 to 9
Bloom time: Late spring to early summer

Care

Keep the soil consistently moist, as this plant really dislikes drying out. Watch for yellowing leaves, which often signal that the soil has become too dry or the drainage is poor. It is a tough plant that rarely needs much fussing.

Watering: Keep the soil damp to the touch at all times.
Feeding: Apply a balanced, slow release fertilizer once in the spring.
Pruning: Cut back dead foliage in late winter to make room for new spring growth.
Repotting: Divide the plant if it becomes too crowded or starts to lose vigor in the center.
Soil: moist, heavy clay or loam
Soil pH: neutral to acidic
Temperature: -25 to 30°C
Humidity: 40 to 80%
Drought tolerance: Low
Lifespan: Perennial, typically 5 to 10 years
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes
Water sitting on the surface of the soil
Growth slowing down significantly

Safety

People: There are no known significant toxic effects to humans.
Children: The foliage is generally safe, but the sharp edges of some sedges can cause minor paper cuts.
Contact allergens: The leaves have fine hairs that can cause mild skin irritation if handled roughly.
Airborne allergens: The wind dispersed pollen may cause mild seasonal hay fever in sensitive individuals.
Edibility: This plant is not considered edible for humans.

How to identify it

distinctly hairy leaves and stems
slender, arching green foliage
spiky, brownish flower clusters
spreads via creeping rhizomes

Height: 0.2 to 0.6m
Spread: 0.3 to 1m
Leaves: green, deciduous
Flowers: brown, green, 1 to 3cm
Fruit: brown, Late summer

Problems to watch for

Rust · Fungal spots may appear on leaves during periods of high humidity and poor airflow.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, autumn
Overwintering: Cut back the old foliage in late winter to make room for fresh spring growth. It is very hardy and requires no special protection.
In containers: It grows well in containers, provided you use a large pot that retains moisture well.

Division

Dig up the clump in early spring.
Use a sharp spade to divide the root mass into smaller sections.
Replant the divisions immediately in moist soil.

Group this sedge with other moisture loving perennials to create a lush, low maintenance bog garden.

Grows well with

Marsh Marigold · They both thrive in the same moist soil conditions.
Meadowsweet · This plant provides a nice vertical contrast to the low growing sedge.

Similar species

Pendulous Sedge · It has a similar look but grows much larger.

Science

Family: Cyperaceae
Genus: Carex
Order: Poales
Class: Liliopsida
Native range: Europe, Western Asia, and parts of North Africa.
Conservation: It is common and widespread throughout its native range and is not of conservation concern.

It survives in the wild by forming dense colonies in wet habitats, effectively outcompeting other grasses for space.

Value to wildlife: larval host plant, nesting material
Pollinators: bees, butterflies
Uses: ground cover, erosion control, rain garden plant

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 6/9
Light: 5/9
Temperature: 5/9
Moisture: 7/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It prefers partial shade but will tolerate full sun if the soil stays consistently moist.
How do I control its spread?: You can dig up the edges of the clump in early spring to keep it within its designated area.

Where the name comes from

The name Carex is an ancient Latin term for sedges, while hirta describes the hairy texture of the foliage.

Good to know

It spreads via underground rhizomes, making it an excellent choice for stabilizing soil.
The specific epithet hirta means hairy in Latin, referring to the fine hairs on the leaves.
It thrives in damp meadows and woodland edges.

Keep your hairy sedge growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.